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The low-voltage power circuit breaker (LVPCB) (Fig. 2) has a two-step stored energy mechanism. This type of mechanism uses an energy storage device, such as a spring, that is “charged” and then released, or “discharged,” to close the circuit breaker. The LVPCB is older technology.
The main classifications of low-voltage circuit breakers are “toggle” mechanism and two-step stored energy mechanism circuit breakers. The molded-case circuit breaker (MCCB) (Fig. 1) has a toggle mechanism with a distinct tripped position, which is typically midway between on and off.
This type of mechanism uses an energy storage device, such as a spring, that is “charged” and then released, or “discharged,” to close the circuit breaker. The LVPCB is older technology. Therefore the trend is away from LVPCB and toward insulated case circuit breakers (ICCB) because of reduced maintenance.
A circuit breaker is designed to keep an undesirably large amount of current, voltage, or power out of a given part of an electrical circuit. Industrial circuit breaker categories tend to follow voltage classes, which are divided according to magnitude.
Circuit breakers found in industrial plants accommodate all voltage levels. However, low and medium-voltage circuit breakers comprise the lion’s share of switchgear used in industrial manufacturing plants. The focus of this article is limited to low-voltage circuit breakers.
Thermal-magnetic trip element operation is detailed in Fig. 6a and 6b. Circuit breakers are classified as being trip free or nontrip free. A trip-free circuit breaker is a circuit breaker that trips even if the operating mechanism is held in the “on” position.
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